MPC875 Freescale Semiconductor, Inc, MPC875 Datasheet - Page 68

• Manufacturer Part Number: MPC875
• Description: Mpc875 Powerquicc Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

FEC Electrical Characteristics
Figure 65
15.2
The transmitter functions correctly up to a MII_TX_CLK maximum frequency of 25 MHz + 1%. There is
no minimum frequency requirement. In addition, the processor clock frequency must exceed the
MII_TX_CLK frequency – 1%.
Table 32
68
M20_RMII RMII_TXD[1:0], RMII_TX_EN to RMII_REFCLK setup
M21_RMII RMII_TXD[1:0], RMII_TX_EN data hold from RMII_REFCLK rising
Num
M5
M6
M7
M8
provides information on the MII transmit signal timing.
MII_RXD[3:0] (Inputs)
MII and Reduced MII Transmit Signal Timing
shows MII receive signal timing.
MII_RX_CLK (Input)
MII_TX_CLK to MII_TXD[3:0], MII_TX_EN, MII_TX_ER invalid
MII_TX_CLK to MII_TXD[3:0], MII_TX_EN, MII_TX_ER valid
MII_TX_CLK pulse width high
MII_TX_CLK pulse width low
edge
MII_RX_DV
MII_RX_ER
MPC875/MPC870 PowerQUICC™ Hardware Specifications, Rev. 4
Figure 65. MII Receive Signal Timing Diagram
Characteristic
Table 32. MII Transmit Signal Timing
M1
M2
M3
M4
35%
35%
Min
—
5
4
2
Max
65%
65%
25
—
—
—
Freescale Semiconductor
MII_TX_CLK period
MII_TX_CLK period
Unit
ns
ns
ns
ns